v5.31.0

Windows: nmake and NSIS updated for Visual Studio 2019, ICU 68. yaz-iconv and yaz-json-parse built on Windows.

Fixed #59 yaz-marcdump - json input and leader at end - undefined behavior.

Enable xi:include processing for yaz_xml_include_glob and yaz_xml_include_simple (used by Pazpar2).

makefile: Fix compilation for parallel builds.